Water is the origination of the life and It's essential ingredient to growth the society. Therefore we must preservation is from several contaminateit happened to guarantee obtainment a clean water that meeting with the several purpose and the human needing. This search aims to studies the effect of leakage petroleum on the grade of Djlla river by investigate the specifications (Temperature, pH, TDS, conductivity, water hardness, TSS, Turbidity, Chlorides ) for period (20 February to 10 April).This study establish that all this factors aforesaid was increase after the leakage of petroleum beyond the pH value was decrease, increase of this factors can affecting on the specific water and aquatic life (fish, bird and others ). Leakage of petroleum can interfere with our wastewater treatment process because the oil can coalesce and solidify therefore water level sensor and pump switches can get fouled by oil causing pump fail to start over and above difficulty to separating the oil from water.